Sometimes when you trying to convert Shared mailbox to Regular mailbox or vice versa on your Office 365 tenant you may face following error: (actually you may face the error when performing any type of mailbox conversions):
Error on proxy command 'Set-Mailbox -type: 'Shared' -Identity: 'your_alias' -Confirm:$False -Force:$True' to server DBXPR04MB205.eurprd04.prod.outlook.com: Sever version 1941996320, Proxy method PSWS: Request return error with the following error message: The remote server returned an error: (500) Internal Servicer Error... +CategoryInfo :NotSpecified: (:) [Set-Mailbox], CmdletProxyException +FullyQualifiedErrorID : Microsoft.Exchange.Configuration.CmdletProxyException,Microsoft.Exchange.Management.RecipientTasks.SetMailbox +PSComputerName : pod51000psh.outlook.com
It seems to be internal Office 365 issue and there is no other solution other than give Microsoft a call, but in case you need convert mailboxes urgently, you may want to use following workaround:
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