Microsoft has issued two new updates for the current Windows 10 10130 preview build. Both are related to a bug that involves Outlook Mail crashing on the OS due to a problem with memory.
For current Windows 10 build 10130 users, one of the updates, with the support number KB3069065, fixed this specific issue:
"When you run Outlook Mail in Windows 10 Insider Preview, it might crash due to a memory error, and does not synchronize e-mail when the app is running in the background."
Windows 10 users who haven't yet updated to build 10130 will be able to download the second patch, with the support number KB3069066, that fixes the same Outlook Mail crashing bug ahead of time, as they are making the big update to 10130.