Da ich auch gerade darüber nachdenke, Cached Mode zu aktivieren und die OST Files ins Netzwerk zu legen...
Offiziell "supported" ist es unter bestimmten Voraussetzungen schon...:
https://support.microsoft.com/en-us/kb/297019
Outlook 2010 or later versions functionality is supported when networked .pst or .ost files are used under the following conditions:
- A high bandwidth/low latency network connection is used.
- There is single client access per file (one Outlook client per .pst or .ost).
- Either Windows Server 2008 R2 or later Remote Desktop Session Host (RDSH), or Windows Server 2008 R2 or later Virtual Desktop Infrastructure (VDI) is used to run Outlook remotely.