outlook, office 365, legal hold

I have a user A who left the company and his outlook  was  previously put on Legal Hold so that nothing could be  deleted from his mail box.

but other userB who was accessing this  user'sA  mailbox wants the mail box to remain active for him so that he can maintain access to the mail box.

do I need to re -enable userA  AD account to maintain legal hold, as I believe legal hold on user A is maintained indefinitely and user B can still access user A mailbox

even userA account is disabled, am I correct? or legal hold has some period only for 90 days or so ?

we have on premise AD synced to 365 through AAD sync

both user's mailbox is in 365
pramod1Asked:
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timgreen7077Exchange EngineerCommented:
No, just give user B full manage access to user A mailbox.

Did you ever remove legal hold from the mailbox? If you did remove it then you will need to re-enable it if you want it to remain in legal hold.
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Bartender_1Microsoft Network AdministratorCommented:
Legal Hold is enabled until it's been removed regardless of whether the account is active or not.

You can provide full access to user B to the mailbox even without enabling the account.  (Similar to a shared mailbox.)

Bartender_1
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Vasil Michev (MVP)Commented:
What's the status of the underlying user object, did you delete it or just disable it? Tryng to get a better understanding of what type of mailbox you currently have for that user - a regular mailbox (on hold) or an Inactive mailbox. Inactive mailboxes are not directly accessible in Outlook, you will need to perform restore/recovery operation for the data if other people need to have access to it.

But if you have kept the user object active, and thus have a regular mailbox on hold, you must keep it licensed - you will be violating the license agreement otherwise. The hold functionality will continue working even if you unlicense it, but that's not something you should do in general.
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pramod1Author Commented:
User left we disabled the ad account and put mailbox on hold legal hold

What should be done in order for other user to access the mailbox
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timgreen7077Exchange EngineerCommented:
If the mailbox is associated with the disabled account you can just give userB access to mailbox. You can give user B access via the Admin Center or via the Exchange shell:

Add-MailboxPermission -Identity "userA" -User "userB" -AccessRights FullAccess -InheritanceType All

Note:
If you changed the mailbox to inactive as mention by @Vasil Michev (MVP), this will not work and it requires an entirely different process.
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