Why did the wallet.dat get abandoned, also is it safe to not upgrade?

[jubalix]

I am very comfortable with 1.7x release and before, is there any reason to upgrade, where is the change log summary

and why was the .dat format abandoned?

thanks in advance

[Abdussamad]

Yeah you should upgrade from such an old version. 1.9.x branch has a few releases now so it's safe.

The changelog is on their github repo:

http://github.com/spesmilo/electrum

[btcven]

I am very comfortable with 1.7x release and before, is there any reason to upgrade, where is the change log summary

and why was the .dat format abandoned?

thanks in advance

.dat extension has no real meaning for the wallet files and could lead to confusion.