The direct answer
EPC Group consolidates multiple SharePoint Server farms into a single SharePoint Online tenant. The work starts with an inventory of each farm, down to site collections, subsites, content volume, customizations, workflows and permissions, because two farms rarely share one structure and a straight copy of both would carry every old problem into the new tenant. A single target information architecture and governance model is then designed, content moves in tested waves, and the engagement closes with a written acceptance and knowledge transfer.
The documented example is a regional bank in 2024: a SharePoint Server 2013 farm that had reached end of life, with 16 site collections and 159 subsites, and a SharePoint Server 2019 farm with 86 site collections and 208 subsites, consolidated into SharePoint Online with new branding, over an estimated eight to nine weeks of assessment, design, deployment and testing. For the move itself, Microsoft's SharePoint Migration Tool supports SharePoint Server 2010, 2013, 2016 and 2019 as sources, and the SharePoint Migration Assessment Tool scans 2010, 2013 and 2016 farms for issues before migration (Microsoft Learn, accessed 2026-10-26); EPC Group chooses the tool per source. The same discipline applies when the sources are Microsoft 365 tenants rather than farms, as in a 2023 consolidation of four acquired companies' tenants into one parent tenant.
Sources and routes
| Source | What EPC Group inventories | Route to the single tenant |
|---|---|---|
| SharePoint Server farm (2010, 2013, 2016, 2019) | Site collections, subsites, volume, customizations, workflows, permissions | Migration waves with the SharePoint Migration Tool or a third-party tool, chosen per farm |
| Another Microsoft 365 tenant | Sites, OneDrive, Teams, identities, licensing | Tenant-to-tenant migration with an identity and cut-over plan |
| File shares | Shares, folder structure, permissions | Migration Manager or the SharePoint Migration Tool |
Documented work
EPC Group engagement data: two legacy SharePoint farms (2013 and 2019) consolidated into SharePoint Online for a regional bank (anonymized engagement summary); four acquired companies' Office 365 tenants consolidated into one parent tenant (anonymized engagement summary); and SharePoint Online design, search and migration advisory for a global law firm moving from SharePoint 2010 (anonymized engagement summary). Client names are not published. Source records are in the Evidence Center.
Primary sources
- SharePoint Migration Tool for SharePoint and OneDrive — Microsoft Learn, accessed 2026-10-26
- Migrate your file shares to Microsoft 365 with Migration Manager — Microsoft Learn, accessed 2026-10-26
Frequently Asked Questions
Can EPC Group merge farms that run different SharePoint versions?
EPC Group consolidates farms of different versions into one SharePoint Online tenant; the regional-bank engagement combined a SharePoint Server 2013 farm and a SharePoint Server 2019 farm. Microsoft’s SharePoint Migration Tool supports SharePoint Server 2010, 2013, 2016 and 2019 as sources.
What happens to legacy workflows and customizations?
EPC Group inventories them in the assessment and decides item by item whether to migrate, rebuild or retire. The SharePoint Migration Tool migrates SharePoint Server 2010 out-of-the-box workflows and SharePoint Designer 2010 and 2013 workflows; anything else is redesigned on the target.
Can EPC Group also consolidate Microsoft 365 tenants after an acquisition?
EPC Group also consolidates Microsoft 365 tenants; one documented engagement brought four acquired companies’ Office 365 tenants into one parent tenant in 2023. EPC Group reports more than 216 M&A tenant migrations between 2023 and 2025.
Talk to a senior architect
A one-hour scoping call with a senior EPC Group architect covers each farm, the target tenant and the order of the waves. Email contact@epcgroup.net or call 888-381-9725.
Documented and anonymized engagements
Named engagements come first; anonymized summaries follow under the anonymized-engagement rule — the client is not named and every statement is EPC-reported. Documents behind named engagements are in the Evidence Center.
- Novartis / Novartis Institutes for BioMedical Research, Inc. — SharePoint 2007-to-2010 migration support; SharePoint 2010 platform health check (2010–2011)Novartis / Novartis Institutes for BioMedical Research, Inc. · 2010–2011 · Contracted — countersigned
- Two SharePoint Farms to SharePoint Online: Regional BankAnonymized engagement summary · Regional bank · 2024
- SharePoint 2010 to 2019 Migration: Regional Bank (2020)Anonymized engagement summary · Regional bank · 2020
- SharePoint Online Document Management: Transportation (2020)Anonymized engagement summary · Transportation and logistics company · 2020
- SharePoint 2010 to Online Design: Global Law Firm (2018)Anonymized engagement summary · Global law firm · 2018
- SharePoint Migration: Federal AgencyAnonymized engagement summary · Government
- SharePoint Migration: Major Healthcare NetworkAnonymized engagement summary · Healthcare