First, I do not have a Pre 2 but a Palm Pre Plus via Verizon but they should be set up similarly with you having the better operating system they promised us but then told us to bend over. In any case -
I have more than 2 months worth of syncs for Calendars and always have. I sync to Outlook via a third party sync (Chapura Software) to sync all other functions but email. Email is synced automatically from Frontier.com (as well as other email services) and it syncs no other functions but email off its servers to my Palm Pre Plus and Outlook on my laptop. I also use Google as a back up calendar because Microsoft products have let me down historically so many times over the last ten years I create backups of its data everywhere I can. I sync Google to Outlook with a one way sync using Google sync software that pushes data from Outlook to Google only. I then sync the Google calendar to the Palm Pre Plus so I have a duplicate on my phone. The only issues I ever have is sometimes the Google calendar will have duplicates, triplicates, quadruplicates of certain items (not all) in the calendar. So about every 4-6 months I clear the Google Calendar and resync and that clears it. Why you are only getting two months I can only guess is a limitation in one of your sync settings, but most likely not on your HP/Palm Pre 2.
As far as the emails deleting, most email packages have settings set up that you can change that allow you to keep or delete emails after they go to the Palm Pre 2 or your computer from wherever they come from. You can set these to either always keep a copy on your server, or never keep one on the server typically once it pushes the data out. For instance my home email is from Frontier.com which I push to my laptop to Outlook. It usually hits my phone first after it goes to Frontier but not always. If it goes to my phone first and I delete then I never see it in my Outlook email. If it goes to my laptop first and I don't look at it on my phone, then it will appear then disappear from my phone. I have that email set that once Frontier pushes it out, no copy is kept on that server. I also have Gmail pushed to my phone which works differently. I can delete from either side which impacts the other side and I set a time frame on my phone on how old I can see my email via the phone. I can also see all of my own created folders from GMiail and move email aroundl. I also have Windows Live.com (essentially Hotmail) that works differently than GMail as messages must always be read on the phone if they get to the phone. If I delete them off the phone before they make it to my laptop then they are deleted, otherwise they appear and must be read on both. No personal created folders for Windows live Mail appear on the phone like it does for GMail so I have to move them around only on my laptop.
My guess regardign your Gmail is that your setting on the Pre 2 for Gmail is to only keep the email for one day on your phone regardless if you delete it or not. Go to your email setting. Hit preferences and account once their via the launcher (upper left corner). Then hit the GMail account. A bunch of options should show up one of which allows you to set time frames to see your Gmail one of which is all which will show all of it to you. I have mine set for two weeks so older than two weeks is not on the phone. There is an option for one month and two weeks, all, and a lot of shorter time frames. Good luck!
