--- title: "Issues To Look Out For When You Are Going To Merge Office 365 Tenants After A Business Merger Or Acquisition | DuoCircle" description: "Join the thousands of organizations that use DuoCircle Find out how affordable it is for your organization today and be pleasantly surprised.Interested in" image: "https://www.duocircle.com/images/og-default.png" canonical: "https://www.duocircle.com/content/office-365-tenant-to-tenant-migration/merge-office-365-tenants/" --- Content # Issues To Look Out For When You Are Going To Merge Office 365 Tenants After A Business Merger Or Acquisition Join the thousands of organizations that use DuoCircle Find out how affordable it is for your organization today and be pleasantly surprised.Interested in [ Talk to an Expert → ](/contact/) [ See what we make ](/products/) ## Issues To Look Out For When You Are Going To Merge Office 365 Tenants After A Business Merger Or Acquisition [Tenant Migration Service Details](/email/tenant-migration)**Click Above** to Learn About Our **100% Done-For-You Tenant Migration Service**. _Migrate unlimited mailboxes_ for a flat fee of **$295/-** _Many organizations have started switching to office 365 because of the various offers and other useful services it offers_. Notably, during mergers and acquisitions, enterprises have to perform [office 365 tenant to tenant migration](/content/office-365-tenant-to-tenant-migration) so that they can combine the data from different tenants in one place. In simple words, O365 merging is the process of combining user’s and other business data through the transfer of office 365 subscription to another tenant. _The office 365 migration tools make office 365 tenant to tenant migration convenient_ and offer services which include - Email migration services like Gmail to Gmail migration. - [Transfer office 365 mailbox to another account.](/content/office-365-tenant-to-tenant-migration/transfer-office-365-mailbox-to-another-account) - Office 365 tenant to tenant migration OneDrive. - Move domain from one office 365 tenant to another. ![office 365 tenant to tenant migration](https://media.mailhop.org/duocircle/images/2020/05/email-gateway-server.png) ### Why Is There A Need To Merge Office 365 Tenants? Office 365 migration tool allows the user - To combine the mailboxes and **consolidate the data** of the user without losing any essential information. - To combine the emails, contacts, tasks, as well as calendars of different tenants. - To import the CSV directly to the mailboxes and also offers folder options to export a folder list. - Use the **advanced algorithm** that assists in combining tasks along with calendars recurrences while performing any activity or task. ### Issues Arising When Enterprises Merge Office 365 Tenants Following are **some of the challenges** that the user faces while handling multiple office 365 tenants While operating various tenants by performing office 365 to office 365 migration, _using the custom domain in different tenants is not possible_. The user needs to detach the domain from the first tenant before adding it to another one. Detaching and repeatedly adding the domain to different tenants breaks the flow of emails, which hampers the organization’s working. _It only takes minutes to attach and detach the domain from one tenant to another_. Another issue when you migrate office 365 to office 365 is that there is a change of [mailbox identities](https://serverfault.com/questions/779463/how-to-use-identity-mailbox). Due to the change in permanent or temporary usernames, there can be a change in mailbox identities. In addition to this, the reconfiguration of MS Outlook and other clients also becomes essential. _Microsoft does not provide the reassigning facility of the mailbox_. The user can have mailboxes from different tenants on the same office 365 database, but there is no reassignment facility. _The office 365 migration services offered by Microsoft do not include password migration_. When the organization is [using DirSync](https://docs.microsoft.com/en-us/office365/enterprise/set-up-directory-synchronization) as well as local AD accounts and also changing the email address together with **Microsoft Online Services IDs** while migration, there is a need to reset the password, the user will have to update the credential on the devices. Businesses that need **hassle-free continuity** of services after a merger or an acquisition can benefit significantly from a dedicated Office 365 migration tool. Before migration, _users must also keep a note of these issues and challenges, so that the whole process can be completed smoothly_. ![office 365 migration tool](https://media.mailhop.org/duocircle/images/2020/05/email-gateway-service-provider.png) ### Join the thousands of organizations that use DuoCircle --- Find out how affordable it is for your organization today and be pleasantly surprised. [Get Tenant Migration Service](/email/tenant-migration)Interested in our Partner Program for MSPs and VARs? Visit Our [MSP Partner Program](/msp-partner-program). ## Ready to talk? Same-day response from someone technical. We tell you yes or no quickly. If yes, we get to work. [Talk to an Expert→](/contact/)[See what we make](/products/) ```json {"@context":"https://schema.org","@type":"Organization","name":"DuoCircle LLC","url":"https://www.duocircle.com","logo":{"@type":"ImageObject","url":"https://www.duocircle.com/images/duocircle-logo.png"},"description":"DuoCircle is a portfolio of specialized email products covering protection, authentication, delivery, and routing. We deliver about 90% of category-leader capability at roughly half the price, backed by experts who own the outcome. 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