If you're using Outlook to access your Office 365 email account or another Exchange-based email account, and you're having problems, we want to get you back to sending and receiving email as quickly as possible. Each Microsoft Exchange mailbox consists of an Active Directory user account and the mailbox data stored in the Exchange mailbox database.
Similar to a disabled primary mailbox, a disconnected archive mailbox can be connected by using the Connect-Mailbox cmdlet with the Archive parameter. This tip to fix Outlook 2010, 2013, 2016 shows disconnected from Exchange server leads to loss of previous profile data. Hey there I have Outlook 365 installed on my computer which is quite an upgrade from my previous email client. Each Microsoft Exchange mailbox consists of an Active Directory user account and the mailbox data stored in the Exchange mailbox database. Learn how to connect a disabled mailbox to an existing user account. For more information, see Manage In-Place Archives in Exchange Server.

There are two types of disconnected mailboxes: Disabled mailboxes: When a mailbox is disabled or deleted in the Exchange admin center (EAC) or using the Disable-Mailbox or Remove-Mailbox cmdlet in the Exchange Management Shell, Exchange retains the deleted mailbox in the mailbox database, and switches the mailbox to a disabled state.
For example, if a user whose mailbox was deleted has a new mailbox, you can restore the user's disabled mailbox to their new mailbox. Outlook connection issues with Exchange mailboxes caused by the RPC encryption requirement. Permanently delete it from the Exchange mailbox database.

If a mailbox is deleted using the Remove-Mailbox cmdlet and either the Permanent or StoreMailboxIdentity parameter, it will be immediately deleted from the mailbox database.

Run the following commands to identify soft-deleted mailboxes in your organization. Close MS Outlook on your system and open Control Panel. You can perform several operations on a disabled mailbox before it's purged from the mailbox database: Connect it to a different user account that isn't mail-enabled, which means the user account doesn't have a mailbox.

A disconnected mailbox is a mailbox object in the mailbox database that isn't associated with an Active Directory user account. Exchange will retain the soft-deleted mailbox for the duration of the mailbox retention period. You can’t send or receive email until you reconnect. All configuration data for a mailbox is stored in the Exchange attributes of the Active Directory user object. 1. I am having the same problem, Outlook 2016 disconnects from the Exchange Server often. The first method is to use the EAC or the Connect-Mailbox cmdlet to connect a disabled mailbox to a user account. During this time, you can recover the archive mailbox by reconnecting it to the same user account that it was connected to before it was disabled. Manage In-Place Archives in Exchange Server, Disable or delete a mailbox in Exchange Server. For more information, see Permanently delete a mailbox. To identify the disabled mailboxes in your organization, run the following commands in the Exchange Management Shell: Soft-deleted mailboxes: When a mailbox is moved to a different mailbox database, Exchange doesn't fully delete the mailbox from the source mailbox database when the move is complete. After a disabled mailbox is automatically purged or permanently deleted by an administrator, the data loss is permanent and the mailbox can't be recovered. Here are scenarios in which you may want to connect or restore a disabled mailbox before the mailbox retention period expires or before it's permanently deleted: You disabled a mailbox and now want to reconnect the mailbox to the same Active Directory user account. The following figure shows the components of a mailbox.