Solving The Gmail Sync Error - UPDATED

If you are unlucky enough to get hit with the dreaded “Not Up To Date” error when trying to sync your Google account, or as Microsoft referred to it as error 801901F5, there’s a quick and somewhat easy fix available for you. First off, the error is due to Google’s new requirement that all data is sent over a secure https connection. Windows Phone does not require your contact data to be sent this way and thus, creates the conflict that results in your account not syncing correctly.
The easy fix for this is to simply add a POP/IMAP account for your Gmail account and not use the rest of the options that the Google sync offers. Unfortunately, that also means that you will lose your calendar events if you are still linking those to your Windows Phone via Gmail Sync. A fix like this should be considered one of those band-aid type fixes for those that need to have immediate access to their Gmail accounts only.
As far as linking your calendars and contacts back to your phone, it is a great idea to merger your hotmail/outlook contacts back to your primary account for Windows Phone anyways, so follow these simple instructions to do so.

- Open www.gmail.com on your PC and select contacts from the drop down menu that originally says “Gmail”
-  Press the check mark box or select “Select All” from the drop down menu above the names on the list.
- From the “More” menu, select Export and save as an Outlook CSV format file. Save this somewhere easy to find, like your desktop.
- Then open your hotmail/outlook email account and import the new contacts to your ‘people’ section. You can then merge duplicate information to a single user and finish the import.

This is a good step to do no matter when the Google bug is fixed. This will make all your contacts active in one place so you don’t have to worry about having an additional email account on your device syncing more than just email. You can also take this a step further by subscribing to your Google iCal settings in hotmail/outlook as well. This will let all your events appear on your home calendar and eliminate the need to run Google sync on any of your devices going forward. Just remember, you won’t be able to ADD events to your Google Calendar from your device.

UPDATE: It looks like the bug might have been squashed. After logging in again to my Google account tonight, the account synced without any major issues.