Outlook 2013 keeps freezing, semi-consistently

I have an oddity of problem with my Outlook's stability. It seems to be freezing up, not at random intervals, but based on a seemingly strange combination of configurations. I have been trying many different combinations, I've even devolved to "Cargo-cult" debugging, since I have no clue what is causing this…

Here is my set up – since I don't know for sure which settings are causing the lockup, I'll probably mention irrelevant things:

• (relatively) clean install of Windows 8 (on hyper-v, if that matters)
• Clean install of Outlook 2013, fully updated
• 3 accounts configured:
  1. Hotmail account
     • configured with ActiveSync
  2. Gmail account
     • Large-ish account (several GB)
     • connected with IMAP
     • Only a few folders are subscribed in IMAP
     • Outlook is set to only display subscribed folders
     • configured to keep messages permanently
  3. Google Apps account, connected with IMAP
     • Small account
     • connected with IMAP
     • All folders IMAP subscribed
     • Outlook is set to only display subscribed folders
     • configured to keep messages permanently
• Several Send/Receive Groups configured, to try different configurations of enabling/disable/partial the different accounts – with different send times, from 60 minutes down to 5 minutes.

The problem is that at certain points Outlook completely freezes up and I have to kill it. This is not consistent – there are some things that cause it immediately almost consistently, there are some times that it just happens by itself after some period of time (sometimes a few moments, sometimes a few hours; sometimes while using it, sometimes after I've been away from it for a few hours).

I have searched all over, and there seem to be many with similar (apparently) problem, and found numerous "solutions" (some even more cargocultish than mine), but so far none of them worked.

• I've removed all the accounts, both all together and one at a time, and re-configured them – eventually it freezes up.
• I've tried uninstalling Outlook, cleaning it up completely – removing files, app settings, registry keys, etc – then reinstalling – eventually it freezes up.
• I've only enabled the Hotmail account, disabling (but not removing) the Google accounts – apparently this does not lock up.
• I've enabled the Hotmail and the Gmail accounts, leaving the Apps one disabled – it seems like it does not lock up.
• With all accounts enabled, it locks up almost immediately after doing a send/receive.
• With only the Apps account enabled, it seems to not lock up.
• With the Hotmail and the Apps accounts enabled (Gmail disabled), it seems like it locks up after a random amount of time.
• With Hotmail enabled, and Gmail and Apps both enabled but set to receive only custom folder downloading (not all subscribed folders) – sometimes it locks up right after a send/receive, sometimes it goes for hours without locking up, and sometimes it only locks up when I send an email.
• I've tried switching the ports for the Google accounts (SSL/465 vs TLS/587), though I have no idea if this should affect, but no real difference.

In short, I honestly have no idea what is actually causing Outlook to lock up, I might be completely barking up the wrong tree. At this point I don't really know what else to try, I'm flipping switches at random here.

I would like to have all 3 accounts enabled, ideally in several groups (e.g. pull down only important folders in a group with short interval, and all other folders in a longer interval) – obviously without freezing up at all.

I've tried putting in all the important details, if there is anything else important to add please let me know.

Another issue that occurred to me might also be connected – the Google accounts don't always synchronize properly, even after a send/receive or "update folder". At least not consistently… though I haven't been able to find a significant connection between this and that.