1. Microsoft Outlook
I use Microsoft Outlook for emails. However, an app version is available for Android. It is a touch optimised version of Outlook for desktop, is stripped down and is missing a few features. However, it can still be considered a desktop version replacement.
2. Adobe Acrobat
Used commonly for opening PDF files, Adobe Acrobat is available for Android. It is touch optimised and stripped down, but it is still awesome!
Hope you enjoy using these desktop apps!
Epic Chas Gamer 😎