Exchange 2013 and Outlook 2013 problems with delegation - possible limitation?

We are currently running into a strange issue with Exchange 2013 and Outlook 2013. I am not sure if it is a limitation of Exchange or Outlook.

We have a system that is set up with Outlook 2013 so that all user mailboxes can be accessed by an administrator account. On the Exchange 2013 server we have been using "Add-MailboxPermission -Identity USERNAME -User adminaccount -AccessRights FullAccess" to enable this access.

In the past couple months we have run into an issue where two of the mailboxes can not be accessed. The message "The set of folders cannot be opened. Microsoft Exchange is not available. Either there are network problems or the Exchange server is down for maintenance." If I run "Remove-MailboxPermission -Identity USERNAME -User adminaccount -AccessRights FullAccess" and then run  "Add-MailboxPermission -Identity USERNAME -User adminaccount -AccessRights FullAccess" I am able to access those two mailboxes, but two other mailboxes break. When I repeat the same steps with those broken mailboxes, another two break.

Any ideas?
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paulrauschAsked:
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timgreen7077Exchange EngineerCommented:
I think there is a limit of only 20 mailboxes that can be mapped to outlook at a time. I believe I ran into this a while ago and there where too many mailboxes and 20 was the limit. There is a number but I can remember how many. If you have over 20 then that is probably your issue.

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timgreen7077Exchange EngineerCommented:
paulrauschAuthor Commented:
Tried the link you provided and I'm still running into the same issues.
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timgreen7077Exchange EngineerCommented:
how many mailboxes is there on that outlook profile.
paulrauschAuthor Commented:
There are 40 mailboxes currently on that outlook profile.
timgreen7077Exchange EngineerCommented:
that may be you issue. too many mailboxes. you will need to create a new account and start adding new mailboxes to that account also. you need to reduce the number of mailboxes in the outlook profile.
timgreen7077Exchange EngineerCommented:
Answer provided to author. closing question.
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