After updating to Virtual Office Mobile (VOM) v 7.2, you notice that all messages from February 2018 are showing as unread.
Virtual Office Mobile v 7.2
Open each conversation that has unread messages. This is a one-time action. Following this, all messages will show with the correct Read status.
This is a known issue with VOM v 7.2.
For more information, see the New Messaging Experience FAQ.