Is it a Virus - Please Help


New Email
For some reason everyone on my mailing list has been sent an email from my Hotmail account with various links attached.
This has now happened 5 times and is becoming embarrassing.
I am not sure if it has originated from my IPad or my IPhone as I use both to access my Hotmail account.
I have spoken to Apple and also to Orange (my mobile service provider) both of whom say it is not their fault but a Hotmail fault.
I tried restoring my IPhone to original settings (losing lots of data in the process due to a failed backup) but it has now happened again.
How do I stop this from continuing.
Please Help
Many thanks:thanks: