This has come up often enough that it merits a post. Reminders of sorts can be set up a few ways in ServiceNow. This is just the pros and cons of each.
So there's a few ways I know of doing this;
Each of these have their pro's and con's, lets get into it.
Probably the easiest to set up as it just requires a report, and a scheduled report.
|Only requires Report, and Scheduled Report||Only occurs at the frequency it scheduled|
|No coding required||Less configurable|
|No email template to set up||Email is set based on report sharing|
|No coding required||Only occurs at the frequency it scheduled|
|Specific to tasks|
|Only Requires Scheduled Job, Event, Notification||Only occurs at the frequency it scheduled|
|Very configurable due to coding||Requires coding|
|Triggers when it's supposed to||Requires Event, Notification, Business Rules, and possibly it's own event queue|
|Very configurable||Requires coding|
|Requires managing the scheduled events if the date/time changes|