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I am not sure if you guys are using license, if you remove the exchange license for a user . his mailbox will be detached from on-premise account . but you may later add it again with user withing retention period. <br />
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office 365 does not delete the mailbox for any user until retention expire.
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I am not sure if you guys are using license, if you remove the exchange license for a user . his mailbox will be detached from on-premise account . but you may later add it again with user withing retention period.

office 365 does not delete the mailbox for any user until retention expire.

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We have a user account on the server that is linked up to an Office 365 mailbox. we want to remove the account off the server but keep the mailbox on office 365. is there a safe way to do this so this doesn't remove the office 365 mail account (that's hosted online)
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We have a user account on the server that is linked up to an Office 365 mailbox. we want to remove the account off the server but keep the mailbox on office 365. is there a safe way to do this so this doesn't remove the office 365 mail account (that's hosted online)

dissociate Server  AD account with office 365 account without deletign mailbox

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).