I have used My Phone Exlorer for more than 6 years (even mada a custom icon so it stands out more for me), It used to be the first thing to reinstall when I updated OS or switched phones.
I still use it to manage my contacts and access messaging for ease of typing, but I unfortunately had to give up on the most important part, the calendar. After a lot of trouble shooting there were just too many bugs in the synchronization with outlook and synchronization filters. I lost my calendar twice (had a slightly time off set backup off course), and struggled too many times with duplications, birthdays shifting etc. The user interface formatting, especially for control windows (tiny fonts, OK buttons and key menu options unreachable off screen etc) no longer works on windows 10. That probably can be addressed, but I don't want to spent the time tweaking given that I no longer trust the calendar sync. Maybe I try again later, and it may just be my specific setup, but the risk of it messing up my work/home calendar is too big right now.
Sorry. Loved the software (and donated twice over the years)