Hi,
this just in from Proquest:

ProQuest is performing a system maintenance to will improve performance and 
enhance Preliability.  The maintenance window will begin Wednesday May 3 at 
11pm and end at midnight.

The following products will be unavailable during this brief window:
    * ProQuest interface products, ProQuest Historical Newspapers, American 
Periodicals Series
    * Third-party databases such as CINAHL® Database with Full Text
Please share this information with your colleagues.

Sherry

Sherry Willhite
Information Resources Analyst
CDL Information Services
California Digital Library