Follow up - As a test I installed outlook.com email via Acitve Sync to outlook 2016. The same thing happens where I can only set the amount of time for an EAS account sync to one (1) month of emails or ALL emails. So this must be something with outlook and EAS. Hosted exchange and Imap allow many options and months/years to sync.
So the big question - I have been very frustrated with smartermail and outlook which most of my clients use. I get it that SmarterTools folks want clients to use webmail but lets be honest, most corporate clients are gonna use outlook.. they have it and that is what they want to use. Maybe some day this will shift, but right now it is a fact.... how the heck do I get large mailbox sizes, 5, 10 or even 20gb mailbox size to work properly?? This is VERY common these days.
I was reading the forums and people were saying to add an account for Imap to do the full email box, and then an activesync account to do calendar, contacts etc... well the problem is if I can only sync one month worth of emails and calendars through outlook 2013/16 with activesync, then most customers will not be happy. How can I tell them to use the activesync account for calendar and only one month of emails and then the imap account for older emails. In fact it is pretty bad solutions in this day and age. I can see if I could do one year or maybe 6 months, which is what I was hoping for.. but how does everyone else handle this??? I have many customers on hosted exchange and many have mailboxes in the 20 - 30gb size, just normal these days...
EAS - one month sync or ALL sync - REALLY??? I made the mistake of assuming it would handle the same offline options as imap and hosted exchange and Smartermail does not handle over 2GB according to their support people.. or it may have sync problems over 2Gb
IMAP - sync all email but won't sync calendars and other stuff
How the heck is everyone doing this to make the customers using Outlook ok with it if they have mailboxes over 2GB???
Thank you very much for your help!