Slack to Teams Migration Tool Comparison: Microsoft vs Prominent 3rd-Party ISV Tools vs Netwoven

Name: Slack to Teams Migration Tool Comparison Table
Creator: Netwoven

Comprehensive comparison between native Microsoft tools, 3rd-party products, and Netwoven’s full-fidelity consulting services.

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Slack to Teams Migration: Tool Comparison

Comprehensive side-by-side analysis of Microsoft native tools, Prominent 3rd-Party ISV Tools, and Netwoven Services.

0/4: Not Supported

1/4: Poor

2/4: Moderate

3/4: Better

4/4: Best

* Analysis based on market capability benchmarking as of March 2026.

Key Features	Microsoft Migration Manager	Prominent 3rd-Party ISV Tools ^*	Netwoven	Comparison Summary
Type of Solution Provided (Service vs. Product)	Native Microsoft Migration Manager tool. You are responsible for configuring and running the tool with limited advisory support from Microsoft FastTrack and documentation on how to use the tool.	3rd party ISV product. Migration tools with included managed migration delivery. Migration engineers assist to plan, configure and execute migrations alongside customer, end-to-end.	End-to-end consulting service. Service includes inventory, assessment, strategy, planning, adoption & change management, UAT, execution, & hypercare.	Netwoven delivers an end-to-end, white-glove migration service built specifically for complex Slack-to-Teams programs — including discovery, information architecture and channel mapping, migration execution, workflow and custom app re-platforming, adoption & change management, and Hypercare. Prominent 3rd-party ISV tools offer an included managed migration delivery model alongside their products; Netwoven’s offering remains more comprehensive in scope across the full migration lifecycle and post-migration adoption.
DM & GM Migration	0/4 Not Supported	1/4 <250K messages per week. ^{1, 2} Requires every user to be migrated to complete 2 consent / authentication requests. ^{2, 3,} Loses original message timestamp. These tools claim to migrate replies. Our testing showed this worked as expected in initial migrations. Our testing showed replies did not migrate in delta migrations. We recommend verifying this scenario. ²	4/4 High velocity: 10M – 30M+ messages per week. No user consent required. Migration to Teams Chat or MS Teams Slack Archive App with full authorship data and fidelity.	Netwoven is currently the only vendor that provides a full-fidelity migration of Slack Direct and Group Messages into Microsoft Teams.
Channel Migration	3/4 Supports migration to new or existing Teams, but only to newly created Channels, created by the tool. No migration to existing Channels. Supports migration to all Channel types (Standard, Private & Shared). Microsoft recently updated the tool to support multi-workspace Slack Enterprise Grid or Enterprise+ environments, but you can only connect the tool to one Workspace at a time.	2/4 Full support for migration to Standard Channels in newly created Teams; author and timestamp are preserved in that scenario only. ^{1, 2} Cannot migrate into Private or Shared Channels of a newly created Team while in Migration mode. Private and Shared Channels can only be written to once the Team is taken out of Migration mode. Author and timestamp are not written to the author/timestamp fields in Teams. ^{1, 2} Migrating into existing channels puts old messages as the most recent in the channel. ^{1, 2} Supports all Slack licensing levels. ^{1, 2}	4/4 Full migration velocity and fidelity (with authorship, timestamp and message interleaving) supported to new and existing Teams and all Channel types. Supports all Slack licensing levels.	Netwoven can migrate your Slack Channel data into any new or existing Team or Channel and will properly interleave and apply authorship and timestamp information. Other vendors have limited capabilities for migration targets, authorship & timestamp data loss and / or slow migration speeds as concerning challenges.
Message migration fidelity	2/4 Timestamp & authorship preserved. Does not support migration of app / bot messages. Limited markup conversion. Doesn’t support migration of custom emoji.	3/4 Timestamp & author is preserved for migration to standard Channel in new Team. Author is preserved for DM / GM to Teams Chat but timestamp is lost. Author and timestamp are not written to the author/timestamp fields in Teams for all other migration targets.² Our testing showed good migration fidelity for message syntax. Doesn’t support migration of custom emoji.	4/4 Timestamp & authorship preserved. Supports migration of app / bot messages. Best markup conversion of tested methods. Standard and custom emoji support.	Netwoven provides the highest fidelity in the migration of message syntax and metadata (timestamps & authorship) of the tested migration methods.
Pinned messages	0/4 Not Supported	2/4 These tools claim to migrate pinned messages. Our testing showed this either didn’t work at all or worked for only the most recent pinned message in a Channel / Chat. We recommend verifying this scenario. ²	4/4 Fully Supported for DM, GM and Channel Messages. All pinned messages are migrated.	Netwoven migrates all pinned messages from Slack DM, GM and Channels. Other vendors either do not support or provide only limited support for migrating pinned messages.
Reactions	Not Supported Their documentation says “Standard Reactions” are supported for Channel Messages.	Not Supported	Not Supported	The Team Graph APIs only supports reactions to be applied with…
Migration of Slack WF’s	0/4 Not Supported	0/4 Not Supported	3/4 Advisory support or “app factory” (dev service) for re-platforming to Power Automate.	Netwoven is unaware of any other vendor that offers the capability to move Slack Workflows to Microsoft 365.
Migration of Slack Custom Apps / Integrations	0/4 Not Supported	0/4 Not Supported	3/4 Advisory support or “app factory” (dev service) for re-platforming to Power Automate & Microsoft 365 / Teams customizations.	Netwoven is unaware of any other vendor that offers the capability to move Slack custom apps and integrations to Microsoft 365.
Channel Message Migration Velocity	3/4 <15M per week (only to new Channels).	2/4 New Standard Channels – >250K messages per week. ^{1, 2} All other Channel Mapping scenarios – <250K messages per week. ^{1, 2}	4/4 18M – 25M per week	Netwoven provides the fastest evaluated migration speeds for Channel message migrations, more than 100x faster than some other vendors. Channel message throughput varies materially by target type — migrations into new Standard Channels are significantly faster than migrations into existing Teams, Private Channels, or Shared Channels across all evaluated tools.
DM/GM Migration Velocity	0/4 Not Supported	1/4 <250K messages per week ^{1, 2}	4/4 10M – 30M+ per week	Netwoven provides the fastest evaluated migration speeds for DM / GM migrations. more than 100 times faster than some other vendors.
Information Architecture for Teams / Channel Hierarchy & Channel Mapping	1/4 An interface is provided to capture mapping or upload a CSV.	1/4 An interface is provided to capture mapping or upload a CSV.	4/4 Guidance provided for: Optimal usage of Teams for RBAC enablement and sprawl management Optimal usage of Channel types for security & governance Optimal Channel Mapping	Netwoven provides reporting and expert guidance to define the ideal Team and Channel information architecture and mapping from Slack to Teams. Other vendors ask you to provide the mapping with minimal to no advice on best practices and specific guidance for your Slack usage & membership.
Migration to Teams Shared Channels	3/4 Supported, but only to newly created Shared Channels created by the Migration Tool.	1/4 Cannot migrate into Shared Channels of a newly created Team while in Migration mode. Shared Channels can only be written to once the Team is taken out of Migration mode. Author and timestamp are not written to the author/timestamp fields in Teams. ^{1, 2} Migrating into existing channels puts old messages as the most recent in the channel. ^{1, 2} <250K messages per week. ^{1, 2}	4/4 Fully Supported to new and existing Shared Channels.	Migration to Shared Channels in Microsoft Teams is a best practice for managing sprawl, increasing resiliency in your information architecture and providing maximum flexibility after the migration. Netwoven provides the only full-capability service to migrate to new and existing Shared Channels.
Migration data security	3/4 No user consent required. Least privileges principles best practices used and verified with discerning enterprise security teams. Storage in your security perimeter, compute in Microsoft’s.	1/4 Least privileges principles are not adhered to in consent requests. We recommend careful review with your M365 Security team. ² Storage and compute of your Slack data is outside your security perimeter.	4/4 No user consent required. Least privileges principles best practices used and validated with discerning client enterprise security teams. All storage and compute in your security perimeter.	Permission scopes requested by migration tooling vary widely by vendor. We recommend that customers review each tool’s requested consent scopes with their M365 Security team to confirm alignment with least-privilege principles and internal data-governance standards before authorizing access to production tenants.
Adoption & Change Management	1/4 Microsoft Teams general adoption materials, Migration Manager documentation, and FastTrack support for how to use the migration tool. These are not really related to helping users with the transition.	1/4 These tools include pre-migration planning, stakeholder communication support, and post-migration support as part of their included managed service engagements.	4/4 ACM Strategy workshops and extensive example content – Communication Plan, Copy, Training Plan, Help Center with seeded content, AI Agent for Help Center.	. Netwoven delivers a dedicated Adoption & Change Management workstream as a core part of every Slack-to-Teams engagement — including executive alignment, persona-based communications, training, champions enablement, and post-migration Hypercare. Prominent 3rd-party ISV tools include pre-migration planning, stakeholder communication support, and post-migration support as part of their included managed service engagements; Netwoven’s ACM program remains more comprehensive in scope and depth.

Notes:
^* Aggregate results based on Netwoven’s independent testing of two prominent 3rd-party ISV Slack-to-Teams migration tools in March 2026. Results shown reflect common/composite behavior observed across both tools.
¹ Based on written responses from Vendor support teams during our testing in March 2026.
² Based on the results of our testing in March 2026.
³ Based on the Vendors’ own published materials in March 2026.