Other things to note/consider:
* Google support is via a reseller (direct with MS for 365)
* Googel contract via a reseller (billing is direct with MS for 365)
* You might have legal issues with Google, if your entity cares about where data resides
* One big feature / UI issue is "folders" not really being folder in Gmail but tags
Activesync is a massively better protocol for replication than IMAP + CALDAV + other
When you have mailboxes over 60Gig, not having Activesync could be an issue
For sweet single sign on, better native experience, better support experience for the same price it would be 365 by default unless you have some other Google service that is pulling you that way. (365 is harder to setup with Dirsync, ADFS etc, but worth it)
As for uptime, in 2 years only had 2 very brief outages on 365 and there have been Gmail outages in that time too. Both of which are way good enough for most people I would have thought. Food for thought I hope.
* Google support is via a reseller (direct with MS for 365)
* Googel contract via a reseller (billing is direct with MS for 365)
* You might have legal issues with Google, if your entity cares about where data resides
* One big feature / UI issue is "folders" not really being folder in Gmail but tags
Activesync is a massively better protocol for replication than IMAP + CALDAV + other
When you have mailboxes over 60Gig, not having Activesync could be an issue
For sweet single sign on, better native experience, better support experience for the same price it would be 365 by default unless you have some other Google service that is pulling you that way. (365 is harder to setup with Dirsync, ADFS etc, but worth it)
As for uptime, in 2 years only had 2 very brief outages on 365 and there have been Gmail outages in that time too. Both of which are way good enough for most people I would have thought. Food for thought I hope.