The best replacement for windows mobile is blackberry.

The best alternatives to windows mobile are rated as following:
★★★★★  blackberry
★★★★★  android
★★★  windows ce
★★★  palm os
★★★  symbian
★★  windows phone
★★  palm
★  ce
★  pocket pc
  blackberry os
  android os
  windows phone 7
  windows embedded handheld
  symbian os
  android mobile
  smartphone
  windows pocket pc
  rim

Your alternative for windows mobile is not listed? Suggest!
Speaking about windows mobile, one probably shouldn't forget about blackberry.

Other search terms related to windows mobile and their ratings are:
★★★★★ blackberry
★★★ lotus notes
★ yahoo calendar
You have in mind a companion for windows mobile and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of windows mobile in all years. Click on graph for more.
windows mobile
blackberry
android